The numbering plan indicator (NPI) is a number which is defined in the ITU standard Q.713, paragraph 3.4.2.3.3, indicating the numbering plan of the attached telephone number. NPIs can be found in SCCP and SMS messages. As of 2004, the following numbering plans and their respective numbering plan indicator values have been defined:
| NPI | Description | Standard |
|---|---|---|
| 0 | unknown | |
| 1 | ISDN Telephony | E.164 |
| 2 | generic | |
| 3 | data | X.121 |
| 4 | telex | F69 |
| 5 | maritime mobile | E.210 and E.211 |
| 6 | land mobile | E.212 |
| 7 | ISDN/mobile | E.214 |
Read more about this topic: Telephone Numbering Plan
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“The task he undertakes
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—William Shakespeare (1564–1616)
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That every man in arms should wish to be?
It is the generous spirit, who, when brought
Among the tasks of real life, hath wrought
Upon the plan that pleased his boyish thought:
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Who, with a natural instinct to discern
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—William Wordsworth (1770–1850)